Fix a typo in HipLoader

rocprof errors out with the following message:
symbol lookup 'KernelNameRef' failed: libamdhip64.so.5: undefined \
  symbol: KernelNameRef

The HipLoader is incorrectly looking for a KernelNameRef symbol
instead of hipKernelNameRef.

Fixed the typo: KernelNameRef -> hipKernelNameRef.

Change-Id: Ia4860e1669707b0c83d67e71b78d362b07a6aaa7

src/roctracer/loader.h

@@ -142,7 +142,7 @@ class HipLoader : public BaseLoader<HipLoader> {
   }
 
   const char* KernelNameRef(const hipFunction_t f) const {
-    static auto function = GetFun<const char* (*)(const hipFunction_t f)>("KernelNameRef");
+    static auto function = GetFun<const char* (*)(const hipFunction_t f)>("hipKernelNameRef");
     return function(f);
   }